Q.Consider two concentric spherical surfaces, S1 with radius a and S2 with radius 2a, both centered at the origin. There is a charge +q at the origin and there are no other charges. Compare the flux φ_{1} through S1 with the flux φ_{2} through S2.

(a) φ_{1} = 4φ_{2}

(b) φ_{1} = 2φ_{2}

(c) φ_{1} = φ_{2}

(d) φ_{1} = φ_{2} /2

Ans: (c)